I actually hope they use Nuke. If they make him a bit more serious, he could be really interesting. They could use him to show how everyone did something wrong in the Vietnam War (the government for even getting involved, the military for making it's soldiers do questionable things & the American public for not supporting the soldiers), compared to the black & white war that Steve came from.

I find the Vietnam War incredibly interesting, so I may be a bit bias.

But unless you start throwing anti-aging fixits around, a Namvet Nuke would be a white-haired government pensioner. If they bring the Nuke story in at all, it's almost certain that he'd be yet another Iraq/Afghanistan veteran.